> After running for several hours, it refused to continue due to "no space > left on device". > I've confirmed the problem trying to save a text file there, same error.
Hmm... I don't see anything amiss in the data you sent, so I'm afraid I don't know what's going on. Have you tried to delete one of the files you just wrote (just to see if other modifications still work, rather than the system behaving as if it's read-only)? Any message about your NVMe device (or its filesystem) in dmesg? > What else could it be and how to fix it? Have you tried unmount+remount? 🙁 Stefan